• MD82C55A/B CDIP-40
MD82C55A/B CDIP-40


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Overview of MD82C55A/B

The MD82C55A/B is a versatile programmable peripheral interface IC featuring 24 I/O pins that can be configured for various input and output operations. It offers three operating modes, including basic I/O, strobed I/O, and bidirectional bus I/O, making it suitable for interfacing with a wide range of peripheral devices.


(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

  • PC0-PC7: Port C bidirectional I/O lines
  • PA0-PA7: Port A bidirectional I/O lines or upper data bus lines
  • PB0-PB7: Port B bidirectional I/O lines or lower data bus lines
  • CS: Chip Select
  • A0-A1: Address Inputs
  • RD: Read Control Signal
  • WR: Write Control Signal
  • ALE: Address Latch Enable
  • IRQ: Interrupt Request
  • VCC: Positive Power Supply
  • VSS: Ground Connection

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the MD82C55A/B IC for a visual representation.

Key Features

  • Programmable I/O: The MD82C55A/B offers flexible programmable I/O capabilities for customized interfacing with peripherals.
  • Multiple Operating Modes: With three operating modes, this IC provides versatility in handling different I/O operations.
  • Interrupt Support: Includes an interrupt request line for handling interrupts from external devices.
  • Address Decoding: Supports address decoding for interfacing with multiple devices in a system.
  • Wide Operating Voltage Range: Operates within a wide voltage range, typically from +5V to +15V, ensuring compatibility with various systems.

Note: For detailed technical specifications, please refer to the MD82C55A/B datasheet.


  • Peripheral Interfacing: Ideal for interfacing with peripheral devices such as keyboards, displays, and sensors.
  • Data Acquisition Systems: Suitable for use in data acquisition systems requiring multiple I/O channels.
  • Embedded Systems: Used in embedded systems for general-purpose I/O operations and interfacing with external components.


The MD82C55A/B provides a flexible and configurable interface for connecting external devices to a microcontroller or processor. It enhances the I/O capabilities of a system and enables efficient communication between the microprocessor and peripherals.

Usage Guide

  • Programming: Configure the ports (A, B, C) and operating mode (I/O, strobed, bidirectional) based on the specific application requirements.
  • Address Setup: Set the address lines A0-A1 for proper address decoding when interfacing with multiple devices.
  • Interrupt Handling: Utilize the IRQ line for responding to interrupts from peripheral devices in a timely manner.

Frequently Asked Questions

Q: Can the MD82C55A/B operate in all three modes simultaneously?
A: No, the MD82C55A/B can operate in either basic I/O, strobed I/O, or bidirectional bus I/O mode at a given time, based on the configuration.

Q: What is the typical voltage range for VCC in the MD82C55A/B?
A: The MD82C55A/B typically operates within a voltage range of +5V to +15V for VCC.


For similar functionalities, consider these alternatives to the MD82C55A/B:

  • 8255: A commonly used programmable peripheral interface IC with similar capabilities to the MD82C55A/B.
  • Zilog Z8536: Another versatile programmable peripheral interface IC known for its reliability and performance in I/O operations.



The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Pkg. Type CERDIP Carrier Type Tube
MOQ 108

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